Apparatus for the twist-spinning of artificial threads



Sept. 9, 1941. K. BERNDT 2,255,594

APPARATUS FOR THE TWIST-SPINNING OF ARTIFICIAL THREADS Filed Aug. 16, 1938 3 Sheets-Sheet l Sept. 9, 1941. k, BERNDT 2,255,594

APPARATUS FOR THE TWIST-SPINNING 0F ARTIFICIAL THREADS Filed Aug. 16, 1958 3 Sheets-Sheet 2 Sept. 9, 1941. K B RNDT' 2,255,594

APPARATUS FOR THE TWIST-SPINNING OF ARTIFICIAL THREADS Filed Aug. 16, 1958 3 Sheets-Sheet 3 Patented Sept. 9, 1941 APPARATUS FOR THE TWIST-SPINNING OF ARTIFICIAL THREADS Karl Berndt, Sehma, Germany Application August 16, 1938, Serial No. 225,080

In Germany August 16, 1937 7 Claims.

The invention relates to an apparatus for the twist-spinning of threads into a vessel completely filled with a circulating precipitant.

According to the invention, spinning apparatus of the above-mentioned type are so designed thatv the precipitant is discharged from the precipitation vessel in the travel direction of the thread and together with the thread. The invention also provides means for conducting the precipitant through the precipitation vessel with regulatable or increased pressure.

According to another feature of the invention, the increased pressure is produced statically or dynamically, i. e. either by maintaining an appropriately great difference in the heights of the precipitation vessel and the appertaining liquid supply vessel or by built-in pumps, for instance helical vane pumps. The pressure of the precipitating liquid may be controlled in the former case by raising or lowering the precipitation vessel, while in the second case it will be governed by the rotatingspeed of the pump. The precipi tating liquid is conducted by one pipe each into the precipitation vessel and out of the precipitation vessel. The two pipes are preferably arranged concentrically to one another and to the spun thread leaving the precipitation vessel. The precipitant is supplied through the outer pipe and is conducted out of the precipitation vessel together with the thread through the inner pipe surrounding the thread produced.

According to the invention the pump may be a helical vane pump the vanes of which may be arranged at the rotating inner pipe, and in the case of a rotating outer pipe also at this pipe. If the outer pipe is also rotating, the helical pump may also be coupled with both pipes or be Stationarily arranged between both pipes. It is preferablyarranged close to the inlet of the precipitating liquid.

Some modes of construction of twist-spinning apparatus according to the invention are shown in Figures 1 to 6 in diagrammatic form. Figures 1 to 3 disclose two modes of construction of twist-spinning apparatus, of which Figure 1 shows a longitudinal section through a spinning device and Figure 2 the connection of several spinning devices at a common pressure space, or a common outlet channel, respectively. Figure 3 shows the twist-spinning apparatus with opened precipitation vessel. Figures 4 to 6 show spinning devices equipped with pumps. Figure 7 shows in disassembled state and in sectional elevation the arrangement of a centrifugal pump for conveying the precipitation liquid. Figure 8 shows in similar section the assembly of the parts in Figure 7, and Figure 9 shows the rotating precipitation vessel of Figure 8.

According to Figure 1 the precipitation vessel containing the circulating precipitating liquid is designated by I. The cover 2 is attached to the precipitation vessel I in usual manner with the aid of a bayonet lock 3 and is provided in the centre with a pipe 4, which extends at its lower end part way into the precipitation vessel. In this extension are arranged openings 5. The pipe is closed at its lower end by a rubber stopper 6, having a funnel-shaped enlargement l and a bore into which is inserted a pipe 8, disposed in pipe 6. The annular space 9 between the two concentricpipes 4 and 8 communicates with the inlet chamber l0, containing the precipitating liquid subjected to excess pressure. The rubber cuff l l seals the pipe 4 against the wall i2 of the inlet chamber, which is closed at its upper part by a rubber disc 13 against the lower part of the trough l 4. In the central opening at the bottom of the trough I4 is arranged a plug 15 into the bore N5 of which is inserted the upper end of the pipe 8.

The precipitating liquid in the inlet chamber l0 is-subjected to a higher static pressure than in the outlet trough M, as is also disclosed in Figure 2. The liquid passes therefore from the chamber H), with the higher pressure, through annular space 9 in the direction of the arrow I! through the openings 5 into the precipitation vessel I, flows past the rotating nozzle l8, provided at the bottom of this vessel, and then up-,

wards in the direction of the spun filaments I9 and in this way arrives in the outlet trough M, which is provided, for instance, with an overflow opening 20.

In Figure 2 is shown diagrammatically the arrangement of six spinning places, connected to a common inlet chamber 2| and to a common outlet trough 22. The inlet chamber is provided at its two ends with funnels 23 and 24, filled with pre-- cipitating liquid up to the level 25. The outlet trough is designated by 26 and the pipe connected to the overflow bore by 21. Fresh precipitating liquid is flowing continually through the feeding conduits 28 in such a quantity that the level of the precipitating liquid remains practically at the same height, so that the pressure is always the same, ensuring a uniform flow of precipitating liquid through the arrangement.

It becomes therefore possible by raising or lowering the funnels 23 and 24, connected to i the inlet vessel by hoses, to regulate the static ly at-the parts l2 and i3.

, -;Special advantages result from'the fact that accumulation of gases in thespinning chamber- ,is effectively prevented. .';It is notinecessary that every spinning unit be provided with .an individual pump. Accordingto' the; invention sev,

pressure of the precipitating liquid and in consequence thereof control the amount of the flow.

In Figure 4 the precipitation vessel is designated by 48. It is provided with a cover 4! supporting a pipe 42, in which is contained the inner pipe 43. Between the two pipes is, arranged a spiral vane conveyor 44 forthe precipitant. Since here the outer and the inner pipe rotate at the same speed, the conveyor vanes are connected with both pipes, for instance, welded, soldered, riveted or bolted. The precipitating liquid flows in the direction of the arrow 45; namely, downwardly through the annular space between the two pipes into the precipitation vessel 48 and from there upwardly in the direction of the spun thread 46 through the inner pipe 43 back into the trough 40 containing the. precipi- A further modification of a device of this kind in accordance with the invention and as shown in Figures '7, 8 and 9 consists in using for conveying the precipitating liquid a centrifugal pump the impeller of which has a larger diameter than the cover pipe and which is preferably arranged at the inlet for the precipitating liquid tating liquid. In the trough 40 are arranged a number of spinning places alongside one ana other similar to the manner shown in Fig. 2.

The precipitating liquid flows slowly inlongitudinal direction of the trough, so that always fresh precipitating liquid is fed to the individual spine ning places. Hence, there'is provided inthis case only a single trough for all spinning places.

In the spinning apparatus according to Fig ure 5 onlythe inner pipe 48 is rotatably arranged and the vessel with the cover and the outer pipe is arranged stationary. The inner pipe 49 is universal-jointed to the rotating nozzle 53 with the aid of the connections 4]. In consequence thereof the inner pipe. 49 is rotating at the same. speed asthe rotating nozzle. ,The vanes 54 of the helical vane pump are therefore only fastened to the inner pipe 49. The connection of the spinning device to thecommon trough is designed in the-same manner as shown in Figure 4.

Figure 6 discloses a construction with a stationary conveyor screw between the rotating pipes 42 and 43.; The spiral vane 59 is laid around the downwardly extended pipe; 5!, which is provided with longitudinal ribs 52 coextending with pipe 5| into the stationary precipitation,

vessel 40. This prevents whirling of the liquid drawn from the vessel 40. V

The spinning, apparatus according to the invention offers the, advantage that itbe'cornes possible .toregulate the flow of the precipitating Iliquidormake it dependent on the nozzle speed,

favourably affecting thereby the product in course of manufacture. The arrangement in accordance with themvention has the further advantage of simply disposed and for operation conveniently accessible only to be pushed upwards together with the pipe 8 arrangedin it, so-that the feed ofthe precipitant-from the inlet; chamber l6 automatically interrupted'and the escape 'of, precipitating liquid from the-outlet vessel isalso prevented, since the pipe 4 inits.upperpositionseals tight- (Compare' Fig. 3.)

eral spinning units may be connected to a com mon pump. An arrangement of thiskindmay, for instance, be designed in such; a; manner that the two hose connections of the vessel-ll, according to Figure 2, are, not connected to one funnel ea h: b t; o a c mmo h lical pump.

.the'pipe 65.)

into the precipitation vessel. The centrifugal pump consists in known manner of two guide wheels and an impelling wheel. The three wheels are separated from one'another, so that they can be inserted separately. Both guide wheels so dimensioned, that they can be inserted from above into the inlet of the precipitating liquid. The inlet guide wheel has an extended cylindrical central part, which prevents the formation of eddies and, besides, direct re-entering into the pump of the precipitating liquid emanating from the precipitation vessel.

The use of 'a centrifugal pump has the special advantage that with increasing speed the delivery of liquid will increase also. Increasing speed, with the same twist in the filament, being pro: portional to the spinning speed, the higher speed of the precipitating liquid desirable for higher spinning speed will be attained simultaneously.

Besides, a centrifugal pump may also be of a multi-stage design. The progress attained in the design of the twist-spinning apparatus when using a centrifugal pump consists therefore in extreme simplification insofar as it becomes possible with uniform design, viz'., without the exchange of parts, to-start all the processes required for twist-spinning by simply increasing the speed.

- Referring to Figures 7, 8 and 9, the rotating vessel or precipitation vessel is, designated by 6|, the rotating nozzle by 62, the storage container for the precipitating liquid by 83. The precipitation vessel is provided with a cover 54 with an upwardly directed tubular portion 65. inner pipe carrying fixed to it the conveyor wheel 67 of the centrifugal pump near its upper end is designated by 66. The opening 68 of the storage container 63 is closed by a packing chamber .69, having in its lower part a rubber packing cuff Hi. -In its interior 1| this chamber accommodates the stationary guide wheel vanes "l2. l3 designates the stationary inlet guide wheel supported in the tapered opening 68. The. guide wheel 13 has in its center an upwardly extending tube 15 which prevents theprecipitant discharged from the precipitation vessel through pipe 65,

from being again directly forced into the precipitationwessel by means of the pump and through the outer pipe 65. Besides, tube 15 servesas a bearing for the upper. end of pipe .66. The dash-point line in the pipe 15 shows its wall thickness. in cases, where the pipe 65 has no pare the dash-point line at the enlargement of 6 din Figure, 9.

7 From the description of Figures 7 to 9 it will be noted that. upon rotation of vessel 6! together with pipes 65 and 5%,the conveyor wheel 6] is'also rotated and bycentriiugal force draws the liquid'from trough 63 and through stationary guide l3 and expels it into chamber H contain- .ing; stationary radial'guide vanes 72, whence it.

The 7 (Comg The, pipes 65 and 6E disclosed in 7 Figures 7 and 8 correspond with the pipes 65 and passes between pipes t and iii into the precipitation vessel 6!.

I claim:

1. Arrangement for spinning artificial threads in a precipitation liquid, including a rotary vessel filled with precipitation liquid and comprising a removable cover, a rotary spinning nozzle disposed in said vessel, two concentric pipes spaced from one another to form an annular space between them and extending through said cover into said vessel, at least one of said pipes being connected with said vessel so as to rotate therewith, means disposed within said pipes and controlled in its operation by the vessel speed for forcing precipitation liquid through said annular pipe space into said vessel to be discharged therefrom through the inner of said pipes together with the thread issuing from said nozzle.

2. Arrangement for spinning artificial threads in a precipitation liquid, including a rotary vessel filled with precipitation liquid, a rotary spinning nozzle disposed in said vessel, a cover disposed on said vessel so as to rotate therewith, two concentric pipes spaced from one another to form an annular space between them and extending through said cover way into said vessel, one of said pipes being connected with said cover so as to rotate with said vessel, a helical vane pump disposed between said pipes and controlled in its output by the vessel speed for forcing precipitation liquid through said annular pipe space into said vessel to be discharged therefrom through the inner of said pipes together with the thread ejected from said nozzle.

3. Arrangement for spinning artificial threads in a precipitation liquid, including a covered rotary vessel filled with precipitation liquid, a rotary spinning nozzle disposed in said vessel, two concentric pipes spaced from one another to form an annular space between them and extending through said top part way into said vessel, said pipes being connected with said vessel to rotate therewith, and a helical vane pump fixed between said inner and outer pipes so that its output is controlled by the speed of said vessel for forcing precipitation liquid through said annular pipe space into said vessel to be discharged therefrom through the inner of said pipes together with the thread ejected from said nozzle.

4, Arrangement for spinning artificial threads in a precipitation liquid, including a covered vessel filled with precipitation liquid, a spinning nozzle disposed in said vessel, two concentric pipes spaced from one another to form an annular space between them and extending into said vessel, means for rotating said nozzle and the inner one of said pipes, a helical vane pump fixed on said inner pipe, so that its output is controlled by the speed of said vessel for forcing precipitation liquid through said annular pipe space into said vessel to be discharged therefrom through the inner of said pipes together with the thread issuing from said nozzle.

5. Arrangement for spinning artificial threads in a precipitation liquid, including a rotary vessel filled with precipitation liquid, a rotary spinning nozzle disposed in said vessel, a cover for closing said vessel, two concentric pipes spaced from one another to form an annular space between them and extending through said top part way into said vessel, said pipes being conn cted with said vessel to rotate therewith, and a stationary helical vane pump disposed between the rotating inner and outer pipes, so that its output is controlled by the speed of said vessel for forcing precipitation liquid through said annular pipe space into said vessel to be discharged therefrom through the inner of said pipes together with the thread issuing from said nozzle. 6. A device for spinning artificial threads into a column of precipitation liquid having a rotating lower portion and a non-rotating upper portion, comprising in combination a rotary spinning nozzle arranged at the bottom of said column, a closed vessel surrounding said nozzle for holding said lower portion of said liquid column, a container disposed above said receptacle and designed for holding said upper portion of said liquid column, two concentric pipes forming an inner space for the passage of thread issuing from said nozzle and an annular outer space, said pipes extending from said container into the interior of said vessel, means for imparting a rotation to said nozzle, said lower portion of said liquid column and at least one of said pipes, and means for forcing precipitation liquid through said annular space into said vessel to be discharged therefrom through said inner space into said container.

7. A device for spinning artificial threads into a column of precipitation liquid having a rotating lower portion and a non-rotating upper portion, comprising in combination a rotary spinning nozzle arranged at the bottom of said column, a closed vessel surrounding said nozzle for holding said lower portion of said liquid column, a container disposed above said receptacle and designed for holding said upper portion of said liquid column, two concentric pipes forming an inner space for the passage of thread issuing from said nozzle and an annular outer space, said pipes extending from said container into the interior of said vessel, means for imparting a rotation to said nozzle, said lower portion of said liquid column and at least one of said pipes, and impelling means disposed near the upper end of said pipes and controlled by the nozzle speed for forcing precipitation liquid through said annular space into said vessel to be discharged therefrom through said inner space in the travel direction of and together with said thread.

KARL BERNDT. 

